CN215578140U - Ungrounded epoxy resin poured 35kV voltage transformer - Google Patents
Ungrounded epoxy resin poured 35kV voltage transformer Download PDFInfo
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- CN215578140U CN215578140U CN202122085838.3U CN202122085838U CN215578140U CN 215578140 U CN215578140 U CN 215578140U CN 202122085838 U CN202122085838 U CN 202122085838U CN 215578140 U CN215578140 U CN 215578140U
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Abstract
The utility model discloses a 35kV voltage transformer poured by ungrounded epoxy resin, which comprises an insulator poured by epoxy resin mixed glue, and an iron core, a primary winding and a secondary winding which are arranged in the insulator; the secondary winding is uniformly wound on the iron core, and a secondary outlet wire is led out from the lower part of the insulator and is connected with a secondary winding outlet terminal; the primary winding is wound on the framework, insulating composite foil is arranged between layers of the primary winding, a high-voltage electrostatic screen is arranged on the outer side of the primary winding, a voltage-equalizing ring is arranged at the upper end of the high-voltage electrostatic screen, and a primary outgoing line is led out from a primary conductive rod and is connected with a primary winding outgoing line terminal; the insulator is arranged on the bottom plate, the primary winding wire outlet terminal is arranged at the upper part of the insulator, the secondary winding wire outlet terminal is arranged at the lower part of the outer wall of the insulator, and a plurality of insulating sheds are arranged on the outer surface of the insulator; the utility model has simple structure, reasonable design, safe and reliable operation, high insulating strength, small local discharge amount and improved product qualification rate.
Description
Technical Field
The utility model relates to the technical field of voltage transformers, in particular to a 35kV voltage transformer poured by ungrounded epoxy resin.
Background
At present, the requirement of users on the partial discharge of a 35kV epoxy cast insulation voltage transformer is higher and higher, and particularly, the local discharge capacity is required to be less than 10pC under the voltage measurement by national power grid companies and southern power grid companies, so that the difficulty is brought to transformer manufacturers. The problem of low partial discharge qualification rate is more, partial discharge is one of the causes of insulation damage, and therefore the partial discharge problem of the 35kV epoxy cast insulation voltage transformer is a problem which is overcome by transformer manufacturers. By analysis, the partial discharge of the 35kV epoxy cast insulation voltage transformer has the following disadvantages: 1. the voltage transformer is internally provided with an uneven electric field, the electric field intensity of the winding end part of the voltage transformer is highest, and particularly the voltage of the position close to a primary wire outlet end is highest, so the electric field intensity is the highest; 2. the product structure is one of the factors directly influencing the product partial discharge, and if the product structure is unreasonable, the partial discharge of the product is difficult to reach the level required by the national standard no matter how to control other factors. Therefore, it is necessary to provide a 35kV voltage transformer capable of reducing partial discharge so as to ensure that the partial discharge of the 35kV epoxy resin cast insulation voltage transformer meets the relevant standard requirements.
Disclosure of Invention
The utility model aims to solve the technical problems and provides a 35kV voltage transformer cast by ungrounded epoxy resin.
In order to achieve the technical purpose and achieve the technical requirements, the technical scheme adopted by the utility model is a 35kV voltage transformer cast by ungrounded epoxy resin, which comprises an insulator cast by epoxy resin mixed glue, and an iron core, a primary winding and a secondary winding which are arranged in the insulator; the method is characterized in that: the secondary winding is uniformly wound on the iron core, and a secondary outlet wire is led out from the lower part of the insulator and is connected with a secondary winding outlet terminal; the primary winding is wound on the framework, insulating composite foil is arranged between layers of the primary winding, a high-voltage electrostatic screen is arranged on the outer side of the primary winding, a voltage-equalizing ring is arranged at the upper end of the high-voltage electrostatic screen, and a primary outgoing line is led out from a primary conductive rod and is connected with a primary winding outgoing line terminal; the insulator is arranged on the bottom plate, the primary winding wire outlet terminal is arranged on the upper portion of the insulator, the secondary winding wire outlet terminal is arranged on the lower portion of the outer wall of the insulator, and a plurality of insulating umbrella skirts are arranged on the outer surface of the insulator.
Preferably: the primary winding is formed by orderly winding a plurality of enameled wires into a coil with a rectangular axial section.
Preferably: the primary conducting rod is a metal round rod.
Preferably: the grading ring is arranged in a ring shape, and the grading ring is made of a metal material, a semiconductor rubber material or a semiconductor plastic material.
Compared with the prior art, the utility model has the following beneficial effects:
1. the utility model has simple structure, reasonable design, safe and reliable operation, high insulating strength, small local discharge amount and improved product qualification rate.
2. The voltage transformer has the advantages that the grading rings are arranged at two ends of the high-voltage electrostatic screen and made of metal materials, semiconductor rubber materials or semiconductor plastic materials, the electric field at the end part of the primary winding can be improved through the structure, the electric field intensity at the end part of the primary winding is effectively reduced, and therefore the partial discharge level of the voltage transformer is improved.
3. The primary conducting rod adopts a metal round bar, so that the electric field intensity on the surface of the primary winding can be reduced, and the initial discharge voltage is improved.
Drawings
FIG. 1 is a schematic view of the main assembly of the present invention;
in the figure: 1. an insulator; 2. a primary winding outlet terminal; 3. a base plate; 4. a secondary winding outlet terminal; 5. an insulating shed; 6. an iron core; 7. a secondary winding; 8. a primary winding; 9. a primary conductive rod; 10. a high voltage electrostatic screen; 11. and (6) a grading ring.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
In the drawings: a35 kV voltage transformer poured by ungrounded epoxy resin comprises an insulator 1 poured by epoxy resin mixed glue, an iron core 6 inside the insulator, a primary winding 8 and a secondary winding 7; the method is characterized in that: the secondary winding 7 is uniformly wound on the iron core 6, and a secondary outlet is led out from the lower part of the insulator 1 and is connected with a secondary winding outlet terminal 4; the primary winding 8 is wound on the framework, insulating composite foil is arranged between layers of the primary winding 8, a high-voltage electrostatic screen 10 is arranged on the outer side of the primary winding 8, an equalizing ring 11 is arranged at the upper end of the high-voltage electrostatic screen 10, and a primary outgoing line is led out from a primary conducting rod 9 and connected with a primary winding outgoing line terminal 2; the insulator 1 is arranged on the bottom plate 3, the primary winding outlet terminal 2 is arranged on the upper portion of the insulator 1, the secondary winding outlet terminal 4 is arranged on the lower portion of the outer wall of the insulator 1, and a plurality of insulating sheds 3 are arranged on the outer surface of the insulator 1.
In the preferred embodiment, the primary winding 8 is formed by winding a plurality of enameled wires regularly to form a coil with a rectangular axial cross section.
In the preferred embodiment, the primary conductive rod 9 is a metal round rod.
In the preferred embodiment, the grading ring 11 is shaped as a circular ring, and the grading ring 11 is made of a metal material, a semiconductor rubber material or a semiconductor plastic material.
When the method is concretely implemented, firstly, the insulator 1 is arranged on the bottom plate 3, the secondary winding 7 is wound on the iron core 6, and a secondary outlet is led out from the lower part of the insulator 1 and is connected with the secondary winding outlet terminal 4; the primary winding 8 is orderly wound on the framework by a plurality of enameled wires, the layers of the primary winding 8 are insulated by insulating composite foil, the high-voltage electrostatic screen 10 is arranged outside the primary winding 8, the upper end of the high-voltage electrostatic screen 10 is provided with the equalizing ring 11, and the equalizing ring 11 is made of metal materials or semiconductor rubber materials or semiconductor plastic materials, so that the electric field at the end part of the primary winding 8 can be improved, the electric field intensity at the end part of the primary winding 8 is effectively reduced, and the partial discharge level of the mutual inductor is improved; the primary outgoing line is led out by the primary conducting rod 9 and is connected with the primary winding outgoing line terminal 2, and the primary conducting rod 9 is a metal round bar, so that the electric field intensity on the surface of the primary winding can be reduced, and the initial discharge voltage is improved.
The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, but not intended to limit the scope of the present invention, and all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (4)
1. A35 kV voltage transformer poured by ungrounded epoxy resin comprises an insulator (1) poured by epoxy resin mixed glue, an iron core (6) inside the insulator, a primary winding (8) and a secondary winding (7); the method is characterized in that: the secondary winding (7) is uniformly wound on the iron core (6), and a secondary outlet is led out from the lower part of the insulator (1) and is connected with a secondary winding outlet terminal (4); the primary winding (8) is wound on the framework, insulating composite foil is arranged between layers of the primary winding (8), a high-voltage electrostatic screen (10) is arranged on the outer side of the primary winding (8), grading rings (11) are arranged at two ends of the high-voltage electrostatic screen (10), and a primary outgoing line is led out from a primary conducting rod (9) and is connected with a primary winding outgoing line terminal (2); the insulating body (1) is arranged on the bottom plate (3), the primary winding outlet terminal (2) is arranged on the upper portion of the insulating body (1), the secondary winding outlet terminal (4) is arranged on the lower portion of the outer wall of the insulating body (1), and a plurality of insulating umbrella skirts (5) are arranged on the outer surface of the insulating body (1).
2. An ungrounded epoxy cast 35kV potential transformer according to claim 1, characterized in that: the primary winding (8) is wound into a coil with a rectangular axial section by a plurality of enameled wires in order.
3. An ungrounded epoxy cast 35kV potential transformer according to claim 1, characterized in that: the primary conducting rod (9) is a metal round rod.
4. An ungrounded epoxy cast 35kV potential transformer according to claim 1, characterized in that: the shape of the grading ring (11) is set to be a circular ring shape, and the grading ring (11) is made of metal materials, semiconductor rubber materials or semiconductor plastic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122085838.3U CN215578140U (en) | 2021-09-01 | 2021-09-01 | Ungrounded epoxy resin poured 35kV voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122085838.3U CN215578140U (en) | 2021-09-01 | 2021-09-01 | Ungrounded epoxy resin poured 35kV voltage transformer |
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| Publication Number | Publication Date |
|---|---|
| CN215578140U true CN215578140U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122085838.3U Active CN215578140U (en) | 2021-09-01 | 2021-09-01 | Ungrounded epoxy resin poured 35kV voltage transformer |
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| CN (1) | CN215578140U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103080A (en) * | 2020-08-31 | 2020-12-18 | 大连北方互感器集团有限公司 | Method for fixing interlayer insulating paper of primary winding of voltage transformer |
-
2021
- 2021-09-01 CN CN202122085838.3U patent/CN215578140U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112103080A (en) * | 2020-08-31 | 2020-12-18 | 大连北方互感器集团有限公司 | Method for fixing interlayer insulating paper of primary winding of voltage transformer |
| CN112103080B (en) * | 2020-08-31 | 2022-04-12 | 大连北方互感器集团有限公司 | Method for fixing interlayer insulating paper of primary winding of voltage transformer |
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